The US was fairly steadily at war against the native tribes for the first hundred some years of its existence. Except to the extent that the War of 1812 compris

The US was fairly steadily at war against the native tribes for the first hundred some years of its existence. Except to the extent that the War of 1812 comprised part of the war with Tecumseh's loose confederacy, none of those wars were declared. There were multiple interventions in Latin America and the Caribbean during the first half of the 20th Century, all undeclared. I think that ship has sailed, probably to practice gunboat diplomacy.